Fluctuation-Induced Conductivity of Tin Superconducting Films with the Overdeposition of Gold

Abstract

Effect of the spin-orbit scattering on the fluctuation-induced conductivity (FIC) above the superconducting transition temperature of tin films was investigated. Samples were prepared by the overdeposition of gold about 1 atomic layer. For comparison, unoverdeposited samples were also prepared. The measured FIC is well explained by the traditional superconducting fluctuation theory with three parameters, i.e. the transition temperature T c , the pair-breaking parameter δ and the normal sheet resistance \(R^{\square}_{\text{n}}\). An experimental relation \(\delta={a+b}R^{\square}_{\text{n}}\) holds for each type of the samples. The values of δ for the gold overdeposited samples were larger than those for the unoverdeposited samples, which is considered to be due to the spin-orbit scattering effect owing to the existence of gold.